greenplumn CDXLLogicalGet 源码
greenplumn CDXLLogicalGet 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLLogicalGet.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLLogicalGet.h
//
// @doc:
// Class for representing DXL logical get operators
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLLogicalGet_H
#define GPDXL_CDXLLogicalGet_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLLogical.h"
#include "naucrates/dxl/operators/CDXLTableDescr.h"
namespace gpdxl
{
//---------------------------------------------------------------------------
// @class:
// CDXLLogicalGet
//
// @doc:
// Class for representing DXL logical get operators
//
//---------------------------------------------------------------------------
class CDXLLogicalGet : public CDXLLogical
{
private:
// table descriptor for the scanned table
CDXLTableDescr *m_dxl_table_descr;
public:
CDXLLogicalGet(CDXLLogicalGet &) = delete;
// ctor
CDXLLogicalGet(CMemoryPool *mp, CDXLTableDescr *table_descr);
// dtor
~CDXLLogicalGet() override;
// accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
CDXLTableDescr *GetDXLTableDescr() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// check if given column is defined by operator
BOOL IsColDefined(ULONG colid) const override;
// conversion function
static CDXLLogicalGet *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopLogicalGet == dxl_op->GetDXLOperator() ||
EdxlopLogicalExternalGet == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLLogicalGet *>(dxl_op);
}
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *, BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLLogicalGet_H
// EOF
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